redis实现 spring-redis-data初学习

今天看了一些redis的客户端实现、主要分为spring-redis-data 、jredis

今天先记录下spring-redis-data的学习心得；

spring-redis-data 中我目前主要用了它的存、取、清除。

先看配置吧redis-manager-config.properties ：

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redis.host=192.168.1.20//redis的服务器地址
redis.port=6400//redis的服务端口
redis.pass=1234xxxxx//密码
redis.default.db=0//链接数据库
redis.timeout=100000//客户端超时时间单位是毫秒
redis.maxActive=300// 最大连接数
redis.maxIdle=100//最大空闲数

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redis.maxWait=1000//最大建立连接等待时间
redis.testOnBorrow=true//<span style="font-size:12px;">指明是否在从池中取出连接前进行检验,如果检验失败,则从池中去除连接并尝试取出另一个</span>

spring 中配置

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<bean id="propertyConfigurerRedis" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="order" value="1" />
<property name="ignoreUnresolvablePlaceholders" value="true" />
<property name="locations">
<list>
<value>classpath:config/redis-manager-config.properties</value>
</list>
</property>
</bean>

<!-- jedis pool配置 -->
<bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
<property name="maxActive" value="${redis.maxActive}" />
<property name="maxIdle" value="${redis.maxIdle}" />
<property name="maxWait" value="${redis.maxWait}" />
<property name="testOnBorrow" value="${redis.testOnBorrow}" />
</bean>

<!-- spring data redis -->
<bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
<property name="usePool" value="true"></property>
<property name="hostName" value="${redis.host}" />
<property name="port" value="${redis.port}" />
<property name="password" value="${redis.pass}" />
<property name="timeout" value="${redis.timeout}" />
<property name="database" value="${redis.default.db}"></property>
<constructor-arg index="0" ref="jedisPoolConfig" />
</bean>

<bean id="redisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate">
<property name="connectionFactory" ref="jedisConnectionFactory" />
</bean>

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<!--配置一个基础类（之后的业务类继承于该类）、将redisTemplate注入 -->

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<bean id="redisBase" abstract="true">
<property name="template" ref="redisTemplate"></property>
</bean>

java代码：

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public class RedisBase {

private StringRedisTemplate template;

/**
* @return the template
*/
public StringRedisTemplate getTemplate() {
return template;
}

/**
* @param template the template to set
*/
public void setTemplate(StringRedisTemplate template) {
this.template = template;
}

}

继续：

下面就是具体redis的值的写入、读出、清除缓存喽！

第一：写入

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public class StudentCountDO {

private Long id;

private String studentId;

private Long commentHeadCount;

private Long docAttitudeScores;

private Long guideServiceScores;

private Long treatEffectCount;

private Long treatEffectScores;

private String gmtModified;

private String gmtCreated;

private Long waitingTimeScores;

}

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StringRedisTemplate template = getTemplate();//获得上面注入的template
// save as hash 一般key都要加一个前缀，方便清除所有的这类key
BoundHashOperations<String, String, String> ops = template.boundHashOps("student:"+studentCount.getStudentId());

Map<String, String> data = new HashMap<String, String>();
data.put("studentId", CommentUtils.convertNull(studentCount.getStudentId()));
data.put("commentHeadCount", CommentUtils.convertLongToString(studentCount.getCommentHeadCount()));
data.put("docAttitudeScores", CommentUtils.convertLongToString(studentCount.getDocAttitudeScores()));
data.put("guideServicesScores", CommentUtils.convertLongToString(studentCount.getGuideServiceScores()));
data.put("treatEffectCount", CommentUtils.convertLongToString(studentCount.getTreatEffectCount()));
data.put("treatEffectScores", CommentUtils.convertLongToString(studentCount.getTreatEffectScores()));
data.put("waitingTimeScores", CommentUtils.convertLongToString(studentCount.getWaitingTimeScores()));
try {
ops.putAll(data);
} catch (Exception e) {
logger.error(CommentConstants.WRITE_EXPERT_COMMENT_COUNT_REDIS_ERROR + studentCount.studentCount(), e);
}

第二、 取出

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public StudentCountDO getStudentCommentCountInfo(String studentId) {
final String strkey = "student:"+ studentId;
return getTemplate().execute(new RedisCallback<StudentCountDO>() {
@Override
public StudentCountDO doInRedis(RedisConnection connection) throws DataAccessException {
byte[] bkey = getTemplate().getStringSerializer().serialize(strkey);
if (connection.exists(bkey)) {
List<byte[]> value = connection.hMGet(bkey,
getTemplate().getStringSerializer().serialize("studentId"), getTemplate()
.getStringSerializer().serialize("commentHeadCount"), getTemplate()
.getStringSerializer().serialize("docAttitudeScores"), getTemplate()
.getStringSerializer().serialize("guideServicesScores"), getTemplate()
.getStringSerializer().serialize("treatEffectCount"), getTemplate()
.getStringSerializer().serialize("treatEffectScores"), getTemplate()
.getStringSerializer().serialize("waitingTimeScores"));
StudentCountDO studentCommentCountDO = new StudentCountDO();
studentCommentCountDO.setExpertId(getTemplate().getStringSerializer().deserialize(value.get(0)));
studentCommentCountDO.setCommentHeadCount(Long.parseLong(getTemplate().getStringSerializer()
.deserialize(value.get(1))));
studentCommentCountDO.setDocAttitudeScores(Long.parseLong(getTemplate().getStringSerializer()
.deserialize(value.get(2))));
studentCommentCountDO.setGuideServiceScores(Long.parseLong(getTemplate().getStringSerializer()
.deserialize(value.get(3))));
studentCommentCountDO.setTreatEffectCount(Long.parseLong(getTemplate().getStringSerializer()
.deserialize(value.get(4))));
studentCommentCountDO.setTreatEffectScores(Long.parseLong(getTemplate().getStringSerializer()
.deserialize(value.get(5))));
studentCommentCountDO.setWaitingTimeScores(Long.parseLong(getTemplate().getStringSerializer()
.deserialize(value.get(6))));
return studentCommentCountDO;
}
return null;
}
});
}

这个存和取的过程其实是把对象中的各个字段序列化之后存入到hashmap 、取出来的时候在进行按照存入进去的顺序进行取出。

第三 清除

这个就根据前面的前缀很简单了，一句代码就搞定啦！

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private void clear(String pattern) {
StringRedisTemplate template = getTemplate();
Set<String> keys = template.keys(pattern);
if (!keys.isEmpty()) {
template.delete(keys);
}
}

pattern传入为student: 就可以将该类型的所有缓存清除掉喽！